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Steel bars embedded in an alkali-activated slag AAS concrete have been exposed after curing for 28 days to an accelerated carbonation chamber 3 % CO2, 65 % relative humidity RH, and 25 ºC temperature and to a laboratory environment 0.03 % CO2, 65 %RH, and 25 ºC. Ordinary Portland cement OPC was also tested for comparative purposes and exposed to identical experimental conditions.Corrosion products generated at the steel-concrete interface were characterized using Mössbauer spectrometry and the X-ray diffractionXRD technique. The main compounds were magnetite Fe3O4, wuestite FeO, and goethite a-FeOOH. The morphology of corrosionproducts was analyzed using the scanning electron microscopy technique SEM.

Tipo de documento: Artículo - Article

Información adicional: Derechos de autor reservados

Palabras clave: carbonation, corrosion, magnetite, wuestite, alkali-activated cement, Portland cement, steel reinforcement





Fuente: http://www.bdigital.unal.edu.co


Introducción



MÖSSBAUER AND XRD ANALYSIS OF CORROSION PRODUCTS OF CARBONATED ALKALI-ACTIVATED SLAG REINFORCED CONCRETES ANÁLISIS DE LOS PRODUCTOS DE CORROSIÓN DE ACEROS EMBEBIDOS EN HORMIGÓN DE ESCORIA ACTIVADA ALCALINAMENTE EXPUESTO A CARBONATACIÓN WILLIAN APERADOR PhD.
Profesor: Universidad Militar Nueva Granada.
Bogotá, Colombia, william.aperador@unimilitar.edu.co JORGE BAUTISTA MSc.
Profesor: Universidad Francisco de Paula Santander, Cúcuta, Colombia, jorgebautista@ufps.edu.co ENRIQUE VERA PhD.
Profesor: Universidad Pedagógica y Tecnológica de Colombia, Tunja., enrique.vera@uptc.edu.co Received for review: January 12th, 2011; accepted: May 17rd, 2011; final version: May 30nd, 2011 ABSTRACT: Steel bars embedded in an alkali-activated slag (AAS) concrete have been exposed (after curing for 28 days) to an accelerated carbonation chamber (3 % CO2, 65 % relative humidity (RH), and 25 ºC temperature) and to a laboratory environment (0.03 % CO2, 65 % RH, and 25 ºC).
Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to identical experimental conditions. Corrosion products generated at the steel-concrete interface were characterized using Mössbauer spectrometry and the X-ray diffraction (XRD) technique.
The main compounds were magnetite (Fe3O4), wuestite (FeO), and goethite (a-FeOOH).
The morphology of corrosion products was analyzed using the scanning electron microscopy technique (SEM). KEYWORDS: carbonation, corrosion, magnetite, wuestite, alkali-activated cement, Portland cement, steel reinforcement RESUMEN: Barras de acero embebidas en el hormigón de escoria activada alcalinamente (AAS) fueron expuestas (después de los 28 días de curado) en una cámara de carbonatación acelerada (3% CO2, 65% de humedad relativa (HR) y 25 º C de temperatura) y un entorno de laboratorio (0,03% CO2, 65% HR y 25 º C).
Cemento Portland (OPC), se probó también con fines comparativos y expuestos a las mismas condiciones experimentales.
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